What is Transpiration and its Importance

Transpiration and its Importance

 

The loss of water in the form of vapour from aerial parts of the plants, especially through stomata is called transpiration. Potometer is used to measure the rate of transpiration.

 

The difference of osmotic pressure is present between lower and upper parts of a plant. This difference produces a pull or tension, which pull the water form high pressure to lower pressure. This pull or suction force is produced in xylem tissue and is called transpiration pull.

 

Due to transpiration pull of water molecules, water moves up in xylem as an unbroken channel called transpiration stream.

 

Factors affecting the transpiration:

Temperature:

 

  1. i) High temperature increases the rate of transpiration.

 

  1. ii) Low temperature decreases the rate of transpiration.

 

Humidity:

 

  1. i) In dry conditions or low humidity the rate of transpiration increases.

 

  1. ii) In wet conditions or high humidity the rate of transpiration decreases.

 

Light:

 

  1. i) In day time, in presence of light stomata remains open. They cause increase in rate of transpiration.

 

  1. ii) In night time, in darkness stomata remain closed. They cause decrease in rate of transpiration.

 

Atmospheric Pressure:

 

  1. i) Low atmospheric pressure increases the rate of transpiration.

 

  1. ii) High atmospheric pressure decreases the rate of transpiration.

 

Importance of transpiration:

 

Transpiration is very important in the plant life as it provides the forces to pull the sap up in the xylem vessels form root to the leaves. Transpiration also keeps the cell surface moist to facilitate the exchange of gases in dissolved state. Tiny openings present on the lower side of leaves are called stomata. Each stoma

is surrounded by sausage shaped cells called guard cells.

 

  1. i) Stomata remain open when guard cells are turgid.

 

  1. ii) Stomata remain close when the guard cells loose their turgidity.

 

Note: First, you need to understand for whom this kind of training was created. On the correspondence form more often people are trained who combine study with work, and also those who can not afford training on full time form. Hence the first “plus”: correspondence higher education in Moscow, even in the most rated university, will be much cheaper than getting knowledge in full time, and the quality of the diploma will depend only on the diligence and diligence of the student. In addition, after graduation students will receive exactly the same diploma as full-time students. The form of training (full-time or part-time (evening), or correspondence, or external) is not indicated in the diploma. Information on this is contained only in the annex to the diploma, which employers rarely require. For admission, the entrant must pass the USE, but there is no competition as such, and it’s much easier to do. The terms of distance learning entirely depend on the specialty. As a rule, the term of study in absentia is about 5.5 – 6 years depending on the specialty, which is 6 to 12 months longer than the full-time study. But if you get a second higher education in correspondence department, you can be enrolled immediately to the third year, and then the term of study will be 3.5 – 4 years. In addition, there is always the opportunity to take exams externally, reducing the duration of studies even more, but this will require a very high level of self-organization and discipline.

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